Make filters use SkImage instead of SkBitmap

include/effects/SkBlurImageFilter.h

Index: include/effects/SkBlurImageFilter.h
diff --git a/include/effects/SkBlurImageFilter.h b/include/effects/SkBlurImageFilter.h
index 6f4537fed75c6dc4dc39238fc3235ec170347b96..ccf27bc543a3de2db96ce36e4e45cd4e661ce71c 100644
--- a/include/effects/SkBlurImageFilter.h
+++ b/include/effects/SkBlurImageFilter.h
@@ -32,14 +32,16 @@ protected:
                       const CropRect* cropRect);
     void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
-    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
-                               SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
+    virtual bool onFilterImage(Proxy*, const SkImage* src, const Context&,
+                               SkAutoTUnref<const SkImage>& result,
+                               SkIPoint* offset) const SK_OVERRIDE;
     virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&,
                                 SkIRect* dst) const SK_OVERRIDE;
 
     bool canFilterImageGPU() const SK_OVERRIDE { return true; }
-    virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
-                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
+    virtual bool filterImageGPU(Proxy* proxy, const SkImage* src, const Context& ctx,
+                                SkAutoTUnref<const SkImage>& result,
+                                SkIPoint* offset) const SK_OVERRIDE;
 
 private:
     SkSize   fSigma;